Lately, I found myself doing some grinding before the Elite 4, so I'm in need of battles against decent levelled Pokemon. The first option are Meteor Falls and Victory Road, since many Pokemon above level 30-35 can be found there. The second is battling trainers I've already defeated. The Pokenav shows me which trainers are up for a rematch, however the locations are totally wrong. True is that is to be assumed, since the game had to rename routes and cities, and the ones that were not renamed or the trainers that weren't relocated have no errors, like the ones found on the above mentioned Meteor Falls. Also, when displaying the map on the Pokenav, although routes and cities are named well, locations aren't, and you can find such things as the ocean current marked where the desert actually is, or the Pokemon Day Care being in the middle of the sea despite being in your hometown.
I don't mind about the map locations, it's not that hard to remember where the places are, but it is hard to relocate the trainers. Since I'm rebattling the whole match call list, I'll try to search for the trainers that have it's location altered and post a thread about their current locations. Well, that is, if it's going to help someone else than just me, which I think so.